Akademik Veri Yönetim Sistemi
Journal of the Brazilian Society of Mechanical Sciences and Engineering, cilt.46, sa.7, 2024 (SCI-Expanded)
The objective of this study is to conduct a comparative analysis of the influence of preload and impact energy levels on the impact response of sandwich composites. Composite laminates were fabricated using carbon woven fibers in a stacking sequence of [0/90]6 and Kevlar woven fibers in a stacking sequence of [0/90]4. Sandwich composites were constructed using the stacking sequences [(0/90)3]/PET/[(0/90)3] based carbon fiber and [(0/90)2]/PET/[(0/90)2] based Kevlar fiber. The production of sandwich composites was conducted using a vacuum infusion system. The curing process was carried out at a temperature of 80 °C for a duration of 12 h. Subsequently, specimens measuring 150 mm × 150 mm were obtained. The specimens were placed in a specially designed test fixture capable of independent compressive loading along both axes prior to impact loading. Then, impact tests were conducted at three distinct energy levels (10, 20, and 30 J) for cases of biaxial tensile, compressive, and pure shear (tension–compression) (at 250 µε and zero preload). Experimental measurements were taken to assess the effect of preload on parameters such as permanent deflection depth, absorbed energy, and peak impact loads. The results revealed that the presence and magnitude of preload had a notable impact on penetration/perforation depth, peak load, and absorbed energy during impact loading. It is crucial to note that preload has a beneficial effect on the impact behavior of composite laminates, whereas it has a detrimental effect on the impact behavior of sandwich laminates.